Relationship between Exposure Index and Overheating Index in Complex Terrain
2003
Chung, U.R. | Yun, J.I. (Kyung Hee University, Suwon, Republic of Korea) | Hwang, B.S. (Gapyong Agricultural Technlolgy Center, Gapyong, Republic of Korea) | Deo, H.H. (Fruit Tree Cultivation Division, National Horticultural Research Institute. RDA, Republic of Korea)
"Overheating index", the normalized difference in incident solar energy between a target surface and a level surface, is helpful in estimating the spatial variation in daily maximum temperature at the landscape scale. It can be computed as the ratio of the 4-hour cumulative solar irradiance surplus or deficit from that over a level surface to the maximum possible deviation (15 MJ m-2) during the midafternoon. Ecosystem models may, for simplicity, use an empirical proxy (exposure index) variable combining slope and aspect in place of the overheating index to account for the variation of midafternoon solar irradiance, A comparative study with real-would landscape data was carried out to evaluate the performance of exposure index in replacing the overheating index. Overheating indices for summer solstice. fall equinox and winter solstice were calculated at 573,650 grid cells constituting the land surface of Donggye-Myun, Sunchang County in Koreas, based on a 10-m DEM.
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